Hi - yes there were quite a lot of changes, including switching to a
different nonlinear registration method - but you are probably right,
the biggest change from your point of view is probably the improved
handling of model confounds in randomise, which is effectively what
you have here - for details on that change, see the posters (this year
or last, can't remember) from Ged Ridgway and Tom Nichols.
Cheers.
On 4 Aug 2009, at 01:39, SUBSCRIBE FSL Anonymous wrote:
> Hello,
>
> I had run a TBSS analysis a couple months back using V1.1 and TFCE
> set to
> the same parameters as those in the current version and the result
> was a
> focal cluster of decreased FA. I re-ran the analysis with the latest
> TBSS
> version (1.2), also with TFCE, and now have more dispersed results
> using the
> same threshold (.95). Such differences are greater than I had
> expected. Is
> the latest version of randomise more somehow sensitive to changes in
> FA?
>
> If it helps, I have 75 subjects in my analysis forming three groups,
> but,
> for this contrast, am comparing only 2 groups. Thus, the contrast
> reads 1 0 -1.
>
> Thanks in advance for your help with this.
>
> -C
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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